Double-chain-stitch sewing-machine.



No. 790,782. PATENTED MAY 2-3, 1905.

' J. J. M. OHAUVET & J. W. COULTER.

DOUBLE CHAIN STITCH SEWING MACHINE.

APPLICATION FILED AUG. 23,1902.

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No. 790,782. PATENTED MAY 28, 1905. J. J. M. OHAUVET & J. W. GOULTER.

DOUBLE CHAIN STITCH SEWING MACHINE.

APPLICATION FILED AUG. 23,1902.

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No. 790,782. PATENTED-MAY 23, 1905. J. J. M. GHAUVET & J. W. GOULTER. DOUBLE CHAIN STITCH SEWING MACHINE.

APPLICATION FILED-AUG. 23.1902.

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UNITED STATES Patented May 23, 1905.

PATENT QFFICE.

JOSEPH J. M. OHAUVET, OF NEWV YORK, AND JOHN W. OOULTER, OF BROOKLYN, NEW YORK.

DOUBLE-CHAlN-STITCH SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 790,782, dated May 23, 1905.

Application filed August 23,1902. Serial No. 120,765.

To all whom it may concern:

Be it known that we,JosEPH J. M.OHAUVET, a resident of theborough of the Bronx, 1n the county of New York, and JOHN W. COULTER,

the cloth-plate detached. Figs. 4 to 12, inclusive, are details.

1 is the bed-plate, and 2 is the arm.

3 is the main shaft, and 41- the needle-bar, operated by any suitable means.

a a are a plurality of needles (two being shown for the purposes of illustration) arranged in a plane substantially at right angles to the line of feed and secured to the needlebar by a plurality of clamping set-screws Z) 6.

c 0 are the parts of the feed-bar which respectively cooperate with said needles.

(Z d are a plurality of loopers which respectively cooperate with said needles and are respectively mounted in the ends of the loopercarriers 6 e, which are secured upon the longitudinally-reciprocating rock-shaft 5.

Each 'looper is of the novel construction shown in detail in the drawings and which may be described as follows:' The blade contains the point-eye d and the shank-eye (l connected by the groove d. For convenience of description the blade may be divided into three portionsthe point portion, the neck portion, and the shank portion. Viewed sidewise the point portion contains a substantially straight lower edge from the extreme point (F to the shoulder (Z substantially parallel with the groove, and an upper edge which curves from the extreme point around the eye (Z and thence extends substantially straight to the shoulder (i which shoulder is located slightly more than one-half the distance from the eye 01 to the eye (Z In plan view the grooved side of the point extends substantially straight from the extreme point cl to the shoulder (Z but the opposite side curves outward from the extreme point, so as to form a hump at the eye (Z and thence inward, so as to form a hollow opposite the shoulder (Z and thence outward, so as to form another hump about the shoulder (Z Between the shoulder d and the eye (Z is the throat of the looper, which is smaller both vertically and horizontally than is the point portion, and the looper enlarges both horizontally and vertically to the shank portion containing the eye (Z Each successive looper in the series extending from left to right contains one additional eye in its shank. Thus, as shown in the drawings, the looper cl contains only the shank-eye d whereas the looper d contains the additional shank-eye 6Z7, located back of the eye d The looper advances to take the needlethread on the right-hand side of the needle, as shown in Figs. 7 and 10, after which the looper still advances in a downwardly-inclined position and the needle rises, so that the loop of the needle-thread on the looper is drawn back onto the throat of the looper back of the shoulders and cl. As the needle then descends and the looper moves backward the described form of the looper-blade acts to retain the loop of needle-thread on the throat of the looper back of the shoulder (Z until the needle has descended into the fabric. This retention of the loop of needle-thread on the throat of the looper holds it back out of the way of the descending needle and prevents it from being entered by the needle and from interfering with the proper engagement of the needle with the looper-thread. As the looper is moving backward and the needle is descending the looper is moved to the left, so that the needle descends upon the non-grooved side of the looper and engages with the looperthread in the position shown in Figs. 8 and 11, after which the looper is moved to the right, so as to return to the position shown in Figs. 6 and 9.

In order to give the described sidewise movements to the looper by the longitudinal reciprocation of the looper-shaft 5, which is parallel with the main shaft 3, we mount said looper-shaft in the bed-plate lug-bearings 6 and 7 and couple it with a parallel plunger 8, also mounted in the lug 7, by a cross-piece 9. The end of the plunger 8 is pivoted to one arm of an elbow-lever 10, fulcrumed upon the base-plate of the machine at 11 and connected at the extremity of its opposite arm with an eccentric 12 on the main shaft by the eccentric-rod 13. The eccentric-rod 13 preferably forms a ball-and-socket joint with the elbowlever 10. The connection between the plunger 8 and rocker will have sufficient free dom of movement to convert the oscillating movement into the rectilinear movement without binding.

The forward and backward motions of the loopers are produced by an eccentric 14: upon the main shaft connected with the loopershaft 5 by the eccentric-rod 15 and the arm 16, which are permitted to reciprocate with the looper-shaft 5 by permitting the eccentric-rod to slide on the surface of its eccentric 14 in a direction parallel with the axis of the shaft 3.

By the construction shown when built of ordinary size the looper-shaft 5 will present a clear space of more than two inches for the reception of the plurality of looper-carriers to any number that may be desired or at any distance apart that may be desired, the number or distance apart of the needles being adjusted upon a proper needle-clamp to correspond. We are thus enabled to secure without difficulty a very wide range of parallel seams either as to distance apart or number, as may be'required.

Each of the plurality of looper threads passes through a separate guideway f f in the post f to the looper nearest thereto, which looper containsa number of eyes al al, &c. corresponding with the number of looperthreads employed. The thread passing through the eye d of the first looper constitutes the thread for that looper; but the thread passing through the eye 61 0f the first looper passes thence onto the eye (Z of the second looper and constitutes the thread for such second looper. By this method of carrying the thread the length of throw of all the threads is substantially the same between the'loopers and the guide-postf Since the take-up of the looper-threads is produced by the backward motion of the loopers, this serves to maintain a uniformity of take-ups between the several threads and a corresponding uni formity in the parallel seams being sewed.

Another important feature of our invention consists in the fact that we construct the workplate slide 17 of such size and so locate it that by its removal substantially the whole length of each of the looper-blades is exposed and freely accessible to the operator, who therefore can thread each and all of the loopers in their backward positions.

The upward and downward motions of the feed-bar 0 c are produced by an eccentric on the main shaft at 18. The forward and backward movementsare produced by the disk 19 on the end of the main shaft, provided on its face with a groove extending across the center and cooperating with a roller-pin 23, engaging with said groove and adjustable by setscrew 24 to various points in said groove, so as to adjust the extent of forward and backward throw of the feed. The train of mechanism connecting said pin 23 with the feedbar consists of the link 20, the pivoted rocker 21, and the link 22. The links 20 and 22 are pivotally connected with the rocker 21, and the motion transmitted from the disk 19 to the feed-bar is a substantially direct reciprocating motion, enabling great exactness of adjustment and freedom from complication.

By omitting the under threads and adopting a form of looper in lieu of those shown which will cause the needle to engage with the loop of its own thread the machine herein described may be adapted for sewing a series of parallel single-thread seams. It will be noticed that this transformation can be effected by simply opening the slide 17 and removing the loopers OZ 0 from the looper-carriers and substituting in their place loopers adapted for single-thread sewing. The facility afforded for this transformation by the arrangement of the parts of my machine also constitutes an important feature of utility. By retaining certain of the under-thread loopers in combination with other loopers without the under thread this machine'can be adapted for sewing a plurality of parallel seams, some of which are composed of single-thread stitches and others of which are composed .of doublethread stitches.

From the foregoing it will be apparent that the plane of oscillation of the loopers is in the general direction of the feed of the Work or transverse to the longitudinal axis of the main shaft 3 instead of being transverse to the direction of the feed of the work, as is the more common arrangement of loopers of doublechain-stitch machines. Our arrangement of the loopers to move approximately in the direction of the feed of the work enables a plurality of loopers to be easily adjusted to vary the width apart of the seams, while the sidewise movements of the loopers when in operation transverse to the direction of the feed and in the direction of their lengths more readily enable the proper concatenation of the threads in forming double-chain-stitch seams than was possible with prior constructions in which the thread-carrying loopers os- IIO IZC

cillated in a single plane in the general direction of the feed, but without lateral or needleavoiding movements.

Having thus described our invention, we claim as new and desire to secure by Letters Patent 1. In a sewing-machine, the combination with the centrally and longitudinally disposed main shaft 3 having bearings for its opposite ends in the machine-frame, of a feeding device, two eccentrics 12 and 14 mounted on said shaft between said bearings, an oscillating and longitudinallyreciprocating looper-shaft 5 arranged in front of and parallel to said main shaft and having bearings for its opposite ends, a plurality of looper-carriers on said looper-shaft between said bearings, connections, comprising the elbow-lever 10, between said eccentric 12 and said looper-shaft, for reciprocating the latter endwise, connections between said eccentric l4 and said looper-shaft for oscillating or rocking the said loopers in a plane approximately transverse to the axis of said main shaft and in the direction of the feed, and a looper--mounted in each of said carriers and movable with said looper-shaft parallel to the longitudinal axis of said main shaft.

2. In a sewing-machine, the combination with the centrally and longitudinally disposed main shaft 3 having bearings for its opposite ends in the machine-frame, of two eccentrics mounted on said shaft between its ends, an oscillating and longitudinally reciprocating looper-shaft 5 in front of and parallel to said main shaft and also having bearings for its opposite ends, a plurality of looper-carriers on said looper-shaft between said bearings, connections between said eccentrics and said looper-shaft for oscillating and reciprocating the latter, and a looper mounted in each of said carriers and movable transverse to the longitudinal axis of said main shaft; each of said loopers having a point-eye cl 2 and a shankeye cl, a groove cl" connecting said eyes, and a shoulder (Z formed by a lateral curvature away from the plane in which the looper-point oscillates.

3. In a sewing-machine, the combination with the centrally and longitudinally disposed main shaft 3 having bearings for its opposite ends in the machine-frame, of a feeding device, two eccentrics mounted on said shaft between its ends, an oscillating and longitudinally-reciprocating looper-shaft 5 in front of and parallel to said main shaft and also having bearings for its opposite ends, a plurality of looper-carriers on said looper-shaft between said bearings, connections between said eccentrics and said looper-shaft for oscillating and reciprocating the latter, a looper mounted in each of said carriers and oscillating in a general direction which is transverse to the longitudinal axis ofsaid main shaft and approximately in the line of the feed, said looper-carriers being adjustable lengthwise of said looper-shaft and parallel to the longitudinal axis of said main shaft, to vary the distance apart of the seams, and a clothplate or work-plate which is provided with a removable slide arranged above said loopercarriers and covering the field of adjustment thereof.

4. In a sewing-machine, the combination with the longitudinally-disposed main shaft 3 provided between end bearings with two eccentrics, of the looper-shaft 5 parallel to and in front of said main shaft, one or more loopercarriers on said looper-shaft, a slide or plunger 8 parallel with said looper-shaft and connected therewith, connections between one of said eccentrics and said slide or plunger for imparting endwise movements to the latter and to the said looper-shaft, and connections between the other eccentric and said loopershaft for oscillating the latter.

5. In a sewing-machine, the combination with the main shaft 3, the looper-shaft 5 and the feed-rocker 21, all extending lengthwise of the machine and parallel to each other, of looper-carriers on said looper-shaft, a feeding device connected with said rocker, means on said main shaft for operating said rocker and for raising and lowering said feeding device, eccentrics 12 and 14L on said shaft to impart oscillating and lengthwise-reciprocating movements to said looper-shaft, connections, comprising the elbow-lever 10, between said eccentric 12 and said looper-shaft, whereby the latter is reciprocated endwise, connections between said eccentric 14 and said looper-shaft whereby the latter is oscillated, and loopers mounted on said looper-carriers and oscillating in a plane approximately transverse to the axis of said main shaft and in the direction of the feed.

6. In a sewing-machine, a thread-carrying double-chain-stitch looper containing a pointeye 6Z2, a shank-eye (Z a groove (Z connecting said eyes, a shoulder (Z at its lower side, a curvature, laterally away from the plane in which the looper-point moves, adjacent said shoulder d, and a reduced throat portion or neck between said shoulder (Z 5 and the said eye (Z combined with a feeding device and with means for oscillating said looper in the direction of its length approximately in the line of the feed, and for reciprocating said looper laterally in a plane transverse to the direction of the feed.

7 In a sewing-machine, a thread-carrying double-chain-stitch looper containing a pointeye 0Z a shank-eye (Z a groove (1 connecting said eyes, a shoulder (Z at its lower side, a curvature, adjacent said shoulder, laterally away from the plane in which the looper-point moves, a shoulder d at its upper side, and a reduced throat portion or neck rearward of said shoulders and forward of said eye d, comnames to this specification in the presence of bined With a feeding device and With means tWo subscribing Witnesses.

for oscillating said looper in the direction of JOSEPH J. M. CHAUVET. its length approximately in thelineo'f tliefeed, JOHN W. COULTER. 5 and for reciprocating said looper laterally in \Vitnesses:

a plane transverse to the direction of the feed. ADOLPH Zoom,

In testimony whereof We have signed our A. B. AI-IRENs. 

